BL5U Photoemission Spectroscopy of Solids and Surfaces
Description
Since the monochromator of BL5U was an old-style spherical grating type SGMTRAIN constructed in 1990s and the throughput intensity and energy resolution were poor, the whole beamline has been replaced to state-of-the-art monochromator and end station. The new beamline has been opened to users from FY2016 as high-energy resolution ARPES beamline. Samples can be cooled down to 3.8 K with newly developed 5-axis manipulator to perform high energy resolution measurements. Users can also obtain spatial-dependence of the electronic structure of solids using micro-focused beam (~ 50 μm). The new electron lens system makes it possible to obtain ARPES spectra without moving samples. This beamline is also equipped with a new high-efficiency spin-resolved ARPES system. It currently enables in-plane (x, y) spin detection and will soon be capable of measuring the out-of-plane (z) component as well.
Fig. 1. Picture and photon flux of BL5U.
Technical Data (Expected Performance)
| Light source | APPLE-II type undulator (λu = 60 mm, N = 38) vertical/horizontal, right/left circular (depending on hν) |
| Monochromator | Monk-Gillieson VLS-PGM |
| Energy Range | 20-200 eV |
| Resolution | hν / ΔE > 10,000 for <10 μm slits |
| Experiments | ARPES, Spin-resolved ARPES, Space-resolved ARPES |
| Flux | <1012 photons/s for <10 μm slits (at the sample position) |
| Beam spot size | 23 (H) x 40 (V) μm |
| Main Instruments | Hemispherical photoelectron analyzer with deflector scan (MBS A-1 Lens#4), Liq-He flow cryostat with 5-axis manipulator (3.8 K-350 K) |
